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Thread: Blue Light Blocking UV!

  1. #1
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    Blue Light Blocking UV!

    Hi everyone,

    Just for your information, I am a student optician and very new to this forum. Please excuse me for any mistake or stupid questions I may raise here!

    Recently, I have discovered something myself. Theory said that the Blue Light Coating on Lenses supposed to blocking the Blue UV, and when we use the test pen to test, the blue light should not go through the lenses. I tried the test pen one time and surprisingly see the light go through "Blue Coating Lenses", but not on "Regular Anti-reflection lenses". I do not understand the reason, may some one please explain it to me.

    Another question is, just right now in Canadian market, which the brand and type of lenses are the best for Blue Light Filter?

    For the Blue blocking, is that just a coating on top of the lenses or The lab actually makes the lenses come with blue blocking already?

    Thank you,

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    Welcome to the Blue Light Hype Train where everything is made up and the points don't matter!

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    Most blue light blockers actually only reduce a small part of the spectrum and are not true blockers i.e. notch or band filters. The name is misleading. If you wish to block blue light completely it is very difficult (saturated yellow or orange lenses often are quite good) but the MAR types are of limited / no use. The blue blocking AR types usually have a narrow band of blue reduced - whether it is of any use is debateable although there are some effects that can be useful. There is a lot of hype about blue blockers - and their effects - but it is fair to say that there can be some limited effects for some people. caveat emptor. As an optical professional you should know about tints - how to recognise when they are necessary, symptoms, assessment and testing methods, management techniques, dispensing options, metamerism, gamuts . macadams ellipses and much more. Empirical prescribing is always a risk

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    Master OptiBoarder AngeHamm's Avatar
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    Quote Originally Posted by rianlam View Post
    Hi everyone,

    Just for your information, I am a student optician and very new to this forum. Please excuse me for any mistake or stupid questions I may raise here!

    Recently, I have discovered something myself. Theory said that the Blue Light Coating on Lenses supposed to blocking the Blue UV, and when we use the test pen to test, the blue light should not go through the lenses. I tried the test pen one time and surprisingly see the light go through "Blue Coating Lenses", but not on "Regular Anti-reflection lenses". I do not understand the reason, may some one please explain it to me.

    Another question is, just right now in Canadian market, which the brand and type of lenses are the best for Blue Light Filter?

    For the Blue blocking, is that just a coating on top of the lenses or The lab actually makes the lenses come with blue blocking already?

    Thank you,
    Is the test pen one designed to work with the exact brand of "blue blocker" lens you're using? If it's from another lens company, it's designed to make their particular lens look good, and may not work the same way for another.

    That said, blue blocking lenses are bunk, and the pens are more bunk.
    I'm Andrew Hamm and I approve this message.

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    I agree about pen test - but don't agree that there are no effects of blue light (although they are overhyped). If you want to stop blue - you have to use a tint not a form of AR coating. The effects of a tint are usually small but an example of where a blue blocker can help is in night driving. Most optical professionals are critical of this but there are thousands of pairs of "night driving" glasses sold. All reduce blue. The science is arguable and there are a few theories as to why they work - or not depending on your view. All I would say is that I find them an improvement - and measurably so. But for others they will be neutral or poor. Perhaps it is time for the optical professions to be trained in tint management.

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    Master OptiBoarder OptiBoard Silver Supporter lensmanmd's Avatar
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    Blue light blocking and Blue light filtering are completely different animals.
    To save time, consider Blue Light filtering products as enhanced UV protection. Nothing more.
    I bend light. That is what I do.

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    The blue pens are 405 nm +/- 10mw they only perform their magic trick with products focused in the 400-420 nm range(for instants Mitsui Chemicals UV++). Many products now are focused on the 435-455 nm range because that has been proposed as the the primary wavelength range emitted from digital devices to combat the newly marketed concept of Digital Eye Strain.

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    unfortunately its just not true - we have some of the most advanced instruments in the world - and although there may be a case for degeneration it does not follow that there are symptoms. I am just un the process of putting a course on filters on youtube - should be finished in around a month - then I intend to put my video collection up for professional use only - around 500 videos of the effects of tints / filters on patients - some of them are mind blowing and will be very controversial.

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    Quote Originally Posted by lensmanmd View Post
    Blue light blocking and Blue light filtering are completely different animals.
    To save time, consider Blue Light filtering products as enhanced UV protection. Nothing more.
    blue light coating is more yellowish hue correct for digital devices, does it specifically have to be blue coating?

    blue filter Ar coating can be blue or green but it’s not for digital devices, it’s more for enhanced protection from LEd lights and the sun??

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    Master OptiBoarder AngeHamm's Avatar
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    Quote Originally Posted by Opticia_n View Post
    blue light coating is more yellowish hue correct for digital devices, does it specifically have to be blue coating?

    blue filter Ar coating can be blue or green but it’s not for digital devices, it’s more for enhanced protection from LEd lights and the sun??
    The filters are stopping HEV blue light from passing through, so a yellowish tinge is the result. The coatings are different; the front side is for all intents and purposes a flash mirror, so it reflects the HEV blue spectrum, hence a bluish/purplish residual reflection.
    I'm Andrew Hamm and I approve this message.

  11. #11
    Master Jedi King of the Lab's Avatar
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    My best blue light filtering lens blocks 22% of the harmful blue light.

    Smoke n mirrors man.
    Erik Zuniga, ABOC.

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